I lost my Mum to cancer last year at the age of 49 after she was given a few months to live, we had to bring my wedding forward and everything, she then died 3 days after i told her she was going to be a grandmother.... i know its a hard times, But listen he's 90 years old and has seen more life than most of us could ever hope for... so just be thankful for that!!! Good luck. Imo god has been kind to him giving him so much life.